We love to watch heroes triumph over dreadful odds — but there's also something kind of irresistible about a hero who struggles with self-destructive impulses. Oftentimes the best characters are the ones who circle the abyss? But who's the best self-destructive character in science fiction or fantasy?

Please include a picture, clip, comic book panel, book cover or other illustration for your favorite self-destructive character. And please mention his/her name, why they're so great, and where they appear. Thanks!

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Top image: Starbuck from Battlestar Galactica. Especially in the first couple seasons, before she got entangled in a love triangle and then a weird resurrection, her tendency to push past her own limits and take crazy risks made us love her all the more.